Thursday, June 28th, 2007
Cerny.js – Method call interception, Schemas, Type checking and more
Category: JavaScript, Library
The library has an entire slew of things:
- method call interception,
- type checking for arguments and return values on function calls,
- programming by contract,
- logging,
- validation of an object against a schema,
- dictionaries,
- pretty printing JSON in text or HTML,
- dependency management,
- easy configuration and
- good documentation.
One of the more out there ideas is for putting design by contract into your JavaScript world via something like this:
JAVASCRIPT:
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var NewMath = {};
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(function() {
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// Shorten some names
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var check = CERNY.check;
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var pre = CERNY.pre;
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var method = CERNY.method;
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// The new division
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function divide(a,b) {
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return a / b;
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}
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// For contracts to be enforced, it is necessary
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// that a function is subject to interception. Therefore
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// CERNY.method must be used.
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method(NewMath, "divide", divide);
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// The precondition for a division
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pre(divide, function(a,b) {
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check(b !== 0, "b may not be 0");
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});
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})();
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A lot to check out here.
Related Content:
- Of DTDs, Namespaces, and Schemas for XML
3 rating from 24 votes
Is it friday already?
Nope. Next!
This has actually been out for a while. Given the dynamic nature of JS though, it seems like some things should be a little more automatic and less verbose. That said there are a few interesting ideas in there.
This is actually very interesting. Although all these ideas are not new, having them in one library is a good academic exercise.
perhaps good with java based javascript engine “Mozilla Rhino” :)
using java 6.0 Script engine.